Cognitive radio sensing method and system

a radio sensing and cognition technology, applied in the field of radio systems, can solve the problems of non-trivial system complexity, difficult practical implementation, high computational complexity, etc., and achieve the effects of improving the sensing quality, enhancing cognition, and enhancing the sensing capability of the receiver

Inactive Publication Date: 2013-07-04
KING ABDULAZIZ UNIV
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Benefits of technology

[0010]In the cognitive radio sensing method, a cognitive radio base station broadcasts a low power reference wideband chirp signal with bandwidth covering a wide portion of the sensed spectrum. Cross-correlation characteristics of the chirp signal in time and frequency domains are exploited to enhance the sensing capabilities of the receiver. At the receiver, spectral resolution in the presence of channel interference is achieved by cross-correl...

Problems solved by technology

Most cognitive computing systems to date have been based on sensing methodologies, which result in high computational complexity.
The problem of spectrum sensing and characterization is a typical trade-off problem where accuracy and the simplicity are inver...

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Embodiment Construction

[0027]The cognitive radio sensing method employs wideband chirp signal frequency modulation for a digital signal, which is used in sensing the operable spectrum of the cognitive radio. The chirp signal is inherently wideband, as its bandwidth spread over a range of frequencies exceeds the signaling frequency of the cognitive radio. The chirp signal is generated by linear frequency modulation of a digital signal. Thus, the instantaneous frequency of the chirp signal increases or decreases linearly with time. As shown in FIG. 1A, the bandwidth of a chirp signal 100a extends from the starting frequency sweep f1 to the final frequency sweep f2. With a proper choice for processing gain, i.e., the FT product, where T is the bit period, is such that the spectrum of the chirp signal has a distinctive, nearly square shape 100b, as shown in FIG. 1B.

[0028]As shown in FIG. 2, the system architecture is a hybrid network 200, comprising a primary radio network 312a and a cognitive “adaptive” radi...

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Abstract

The cognitive radio system and method uses a wideband chirp signal for characterization of the spectra that a mobile radio may use. A cognitive radio base station broadcasts the low power reference wideband chirp signal with bandwidth covering the sensed spectrum. At the receiver, spectral resolution in the presence of white noise is achieved by cross-correlating the chirp signal with a locally generated copy of itself (i.e., matched filtering). A Fast Fourier Transform (FFT) is applied to the output of this matched filtering. The FFT output is fed to a decision circuitry, where a threshold value is set to decide the minimum amplitude of utilized frequencies. This process eases sensing computational complexity and improves the quality of sensing, thereby offering enhanced cognition at the cognitive radio receiver.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is a continuation-in-part of my prior U.S. patent application, Ser. No. 13 / 562,133, filed Jul. 30, 2012, which is a continuation of my prior U.S. patent application Ser. No. 12 / 662,656, filed Apr. 27, 2010.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to radio systems providing wireless voice and data communications, and more particularly, to a cognitive radio sensing method and system that is capable of changing its operating parameters responsive to a changing and unanticipated radio environment, and performs such cognitive functions using a wideband chirp signal to reduce computational complexity.[0004]2. Description of the Related Art[0005]Most traditional radios have their technical characteristics set at the time of manufacture. More recently, radios have been built that self-adapt to one of several preprogrammed radio frequency (RF) environments that might be encounter...

Claims

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Application Information

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IPC IPC(8): H04B15/00
CPCH04B1/69H04W24/10H04B2001/6912H04B15/00H04B17/345H04L27/103H04W16/14H04B17/005H04L27/0006Y02D30/70
Inventor BARNAWI, AHMED M.
Owner KING ABDULAZIZ UNIV
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